قارن الطرق

	تصميم تجريبي مضبوط بمجموعة ضابطة مزدوجة التعمية	تصميم التجربة بالمجموعة الضابطة
المجال	التصميم التجريبي	التصميم التجريبي
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	1930s–1950s (formalized in clinical trial methodology)	1935 (Fisher); 1963 (Campbell & Stanley codification)
صاحب الطريقة	R. A. Fisher (experimental control foundations); blinding practices evolved in clinical research through the 20th century	Ronald A. Fisher; systematised by Donald T. Campbell & Julian C. Stanley
النوع	Experimental research design	Experimental research design
المصدر التأسيسي	Fisher, R. A. (1935). The Design of Experiments. Oliver and Boyd.	Campbell, D. T., & Stanley, J. C. (1963). Experimental and Quasi-Experimental Designs for Research. Rand McNally.
الأسماء البديلة	double-blind controlled experiment, DB-CG design, double-masked controlled trial, double-blind controlled study	controlled experiment, true experimental design, randomized controlled design, treatment-control design
ذات صلة	5	4
الملخص	A double-blind control group experimental design is a rigorous experimental structure in which participants are randomly assigned to at least one treatment group and one control group, while both the participants and the researchers collecting or assessing outcomes are kept unaware of group assignment. By combining allocation concealment with blinding at two levels, the design minimizes expectancy bias, placebo effects, and assessor bias simultaneously, making it a cornerstone of high-quality intervention research in medicine, psychology, and the social sciences.	Control group experimental design is a fundamental experimental structure in which participants are assigned to at least two groups — a treatment group that receives the intervention and a control group that does not — so that the effect of the intervention can be isolated by comparing outcomes across groups. Randomisation of assignment strengthens causal inference by balancing known and unknown confounders.